Where does “bioderko” come from?

bioderko (Polish) comes from Polish -ko, from Old Polish -ko, from Proto-Slavic -ъko.

Ancestry of “bioderko”, step by step

StepLanguageWordMeaning
1Polish-koDiminutive suffix for neuter nouns
2Old Polish-kodiminutive suffix for neuter nouns; may cause various vowel shifts
3Proto-Slavic-ъko—
Every word from Proto-Slavic -ъko →Every word from Polish -ko →Every word from Old Polish -ko →